(United Kingdom please)
I use matte mouse by maybelline4foundation
Does anyone know of a good concealer for around (preferably under) 10/15 pounds

I use Rimmel - Hide the blemish. Does the trick and lasts forever.

Builders plaster..

For around £20 you can Yves Saint Laurent 'touche ectlat' which is really, really good...I'd definitely recommend it! You can get it from any department store...like Debenhams.

people say youre supposed to spen alot on concealer
but any regular cheap concleaer works fine, you just need to blend it well.
and since the matte mousse is liquid-to-powder, you should definitely use a liquid concealer. (revlon is pretty good)

It depends on your skin type I think. If you've got normal or oily skin, there are loads of concealer sticks from mid-range high street brands like No7, L'Oreal, Maybelline etc which would be fine.

My skin is very dry so I find concealer sticks to leave me looking like a big flake!! Instead I use liquid/cream concealers (ones with wands), which are unfortunately very limited on the high street. Maybelline did a fantastic one called Everfresh Concealer, but have recently stopped selling it, although I found a stall on my local market selling them today so have bulk bought!! It blends really easily without leaving marks and lasts all day. Revlon do a good one but I don't think you get a huge amount for the money you pay.

The best concealer for dark circles and general blemishes is by far Touche Eclat - I use this under my eyes and my other concealer for everything else. You can get it for less than £13 on a good day on eBay!!

revlon and almay make good concealers.

maybelline coverstick

lorel true match you can buy it at any drug store aqnd then ad a nice powder with a golden shimmer powder or blush i love how it looks
p.s. it has sun screen in it
good luck